To aid in the comparison of sizes of different geographic regions, areas between 1 km² (100 hectares) and 10 km² (1000 hectares) are listed below. See also areas of other orders of magnitude.

• Areas smaller than 1 km²
• 1 square kilometre (U.S. spelling: square kilometer), symbol km², is an SI unit of surface area. It is one of the SI derived units. It is equal to:
  • 100 hectares
  • 1 E+6 m² or 10⁶ m² in scientific notation
  • 1,000,000 m²
  • 0.386 square miles
  • 247.105381 acres
  • the area of a square of side length 1 km
  • a cube with this surface area has sides of length 408 m
  • a circle of this area has a radius of 564 m
  • a sphere of this surface area has a radius of 282 m
• 125 hectares-size of the National Mall in Washington, DC.
• 135 hectares—the campus of the United States Naval Academy
• 179 hectares—Bennebroek, smallest municipality in the Netherlands
• 195 hectares—Monaco (country ranked 192^nd by area)
• 200 hectares—Herm, Channel Islands
• 250 hectares—Hyde Park and Kensington Gardens in London
• 258.998811 hectares—1 mile² or section (USA)
• 290 hectares—City of London
• 320 hectares—Hampstead Heath in London
• 341 hectares—Central Park in New York
• 400 hectares—Great Wall of China, largest human structure.
• 460 hectares—Pitcairn Island
• 493 hectares—University of the Philippines, Diliman
• 515 hectares—Falls Church, Virginia, the smallest county-level political subdivision in the United States by area.
• 650 hectares—Gibraltar
• 890 hectares—size of largest organism on Earth, Armillaria ostoyae. ^[1]
• Areas larger than 10 km²

[edit] Notes

Orders of magnitude for area
1 E-30 m² = 1 fm2	1 E-24 m² = 1 pm2	1 E-18 m² = 1 nm2	1 E-12 m² = 1 µm2	1 E-6 m² = 1 mm2	1 E0 m² = 1 m2	1 E+6 m² = 1 km2	1 E+12 m² = 1 Mm2	1 E+18-24 m² : 1 Gm2
10 fm2	10 pm2	10 nm2	10 µm2	10 mm2	10 m2	10 km2	10 Mm2	> 1 E+24 m² : 1 Tm²
100 fm2	100 pm2	100 nm2	100 µm2	100 mm2 = 1 cm2	100 m2 = 1 a	100 km2	100 Mm2
1,000 fm2	1,000 pm2	1,000 nm2	1,000 µm2	10 cm2	10 a	1,000 km2	1,000 Mm2
10,000 fm2	10,000 pm2	10,000 nm2	10,000 µm2	100 cm2	10,000 m2 = 1 ha	10,000 km2	10,000 Mm2
100,000 fm2	100,000 pm2	100,000 nm2	100,000 µm2	1,000 cm2	10 ha	100,000 km2	100,000 Mm2
SI derived unit square metre, from base unit metre				Conversion of units for area			This box: view • talk • edit